Brace.



11 .747.7476. I PATENTBD DEG. 22,1903.

' A. s. E. METOALF.

BRACE.

APPLICATION FILED JAN. 18,1903.

H0 MODEL.

WITNESSES 1/7 751770;?

57% 7 I H IATTOHN U ITED STATES Patented December 22, 1903. I

PATENT OFF-ICE.

BRAC E.

SPECIFICATION forming part of Letters Patent No.- 747,746, datedDecember 22, 1903. Application filed January 16, 1903. Serial No.139,298. (No model.)

I will describe a brace embodying my in-- vention and then point out thenovel features in the appended claims. Reference is to be had to theaccompanying drawings, forming a part of this specification, in whichsimilar characters of reference indicate corresponding parts in all thefigures. Figure 1 is a side elevation of a brace embodying my inventionand showing the jaws as clamping a bit. Fig. 2 is' a longitudinalsection thereof. Fig. 3 is a longitudinal section showing the jawsengaging with a nut.

Fig. 4 is a section on the line m a of Fig. 2.. Fig. 5 is an inner faceview of one of the jaws, and Fig. 6 is a perspective view showing thespring connection between the jaws.

Referring to the drawings, 1 designates the shank of the brace,connected to the handle 2 by the ordinary ratchet mechanism 3. Thisshank 1 is provided with a thread 4:, engaged by the interior thread ofa sleeve 5, the outer end of which is curved or made cam shape,

as indicated at 6, for engaging withthe jaws and operating them, as willbe hereinafter described.

On the end of the shank 1 are oppositelyextended lateral wings 7 8. Ajaw 9 is pivotally connected to the wing 7, and a jaw 10 is pivotallyconnected to the wing 8, the jaws, as clearly indicated in the drawings,being provided with recesses to receive said wings. The inner ends ofthe jaws, as indicated at 11, are extended downward below the pivotalpoints and are curved for engaging with the cam-surface 6 of the sleeve5. Outward of the pivotal points each jaw is provided with Q a V-shapedchannel 12 for receiving the angular end of a bit or drill, and thesechannels, as clearly indicated in Fig. 5, are longitudinally tapered.The outer ends of the jaws are caused to. move outward or from eachother by means of a spring, here shown as consisting of a wire 13,passed through a perforation in the shank, one member of said springbeing engaged with the'jaw 9, while the other branch or member of thespring engages with the jaw 10.

In the operation by moving the sleeve 5 downward on the shank or towardthe. handle the jaws will be'separated by the spring, so as to receivethe desired tool or to engage with a nut, and obviously the range ofmovement is such as to adapt the jaws to various sizes of nuts.

By moving the sleeve 5 outward against the portions 11 of the jaws theouter ends of the jaws will beclamped firmly in connection with the toolor with a nut. 'To engage firmly with a nut,,the jaws havetransversely-extended parallel jaws 14 at their inner sides.

A substantially v-shaped notch is formed between the wings 7 and 8,which by receiving the end of the tool will center the same, and thewalls of the notch engaging with the angular end of the tool will reducetwisting strain on the jaws, and by making the notch V-shaped it willreceive and hold the ends of different-sized tools.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1.-A threaded shank, oppositely-extended wings on theend of said shank and having a V-shaped notch between them, jaws pivotedto the wings, and a jaw-operating sleeve on the threaded shank.

2. A brace having a threaded shank, a

sleeve operating on the shank and having a cam end, oppositelaterally-extended wings on said shank and having a notch between them,jaws pivoted to said wings, extensions on the jaws for engaging with thecam end of said sleeve, and a spring for'opening the jaws.

3. A brace having a threaded shank, a sleeve for operating on theshankand having a cam end, opposite laterally-extended wings a on saidshank and having a V-shaped notch name to this specification in thepresence of between them, jaws having recesses in which two subscribingwitnesses. said wings extend, the said jaws being piv- H Oted to Said gcurved projections on Said ARIHUR STERLING ETHELBIRI MD'ICALF. jaws forengaging with the cam end of the Witnesses:

sleeve, and a spring for opening the jaws. JAMES GRAHAM, In testimonywhereof I have signed my GEO. H. FLYNN.

